﻿using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace WindowsFormsApp7
{
    public class zhao
    {
        private static string conString = "server=.;database=Schools;uid=sa;pwd=zh13859534493;";
        public static DataTable GetDataTable(string sql)
        {
            SqlConnection connection = new SqlConnection(conString);
            SqlDataAdapter adapter = new SqlDataAdapter(sql, connection);

            connection.Open();

            DataTable dt = new DataTable();
            adapter.Fill(dt);

            return dt;
        }
        public static int AddOrUpdateOrDelete(string sql) 
        {
            SqlConnection connection = new SqlConnection(conString);

            SqlCommand command = new SqlCommand(sql, connection);
            connection.Open();

            return command.ExecuteNonQuery();
        }
    }
}
